Telephone-circuit



` 0.1.3.- SGRIBNER.

` TELEPHONE CIRCUIT. y y n NQ. 2941336. Patented Feb.. 26,-1884.

n .n f A. l

wnwnsss.

,UNITED STATES PATENT OFFICE. 1

oHARLEs E. scRIRNER, on cHIcAGo, ILLINOIS.

'TELEPHONE-CIRCUIT,

SPECIFICATION forming lpart of Letters Patent No. 294,336, dated February 26, 1884.

v Application iiled October 11, 1881. Renewed December 31, 1883. (No model.)

To @ZZ whom it may concern:

Be it known that I, CHARLES E. SORIBNER, of Chicago, Illinois, have discovered certain new and useful Improvements in Subscribers Telephone-Circuits, of which thefoll'owing is a full, clear, concise, and exact description.

My improvement relates to the circuits be-v tween two or more subscribers stationswhen connected with the central office bythe same telephone-line.

The secrecy-switch and bell herein shown form the subject-matter heretofore filed by me.

The generator is of the well-known Siemens type.

Heretofo're signal-bells have been used at the different stations of a given line, so constructed that any one may be .rung vfrom the central ofice without ringing any other;v but no suitable means have been devised, so far as I am informed, whereby all the generators of a given line may be cut off at either of the stations of a given line, so as to prevent all of the `other subscribers on a given line from in terrupting the one who is using the line. As now constructed, it is found most convenient -of two applications to run a separate telephone-line from the een# tral office to 'each subscribers station. By the use of my invention several subscribers may be so placed upon a single line that one who is using the line cannot be annoyed by the others sending signals to line.`

In the drawing, which is diagrammatic, A is the central office. B and C are respectively two subscribers outfits placed upon a single line, a, which ordinarily is connected through the switch-levers -b c, one after the other, and then back, through the bell (Zand generator e, and bell f, and generator g, to ground. When the switch-lever is moved at either station, the generator of said station and also the generators of all other stations will be cut oii' from the individual line.

vthat is in use.

phone mof station C had been taken down and the contact of lever c with platenbroken. It will be seen, as in the formercase, both the generators would be cut off from the receiver And in likemanner, .whether theA stations on a single line are few or many, all the .generators will be cut foff from-a receiver that is in use. When the several stations on a single line are thus connected, the bell and generator coils will be beyond all the telephone-switches upon that line. The resistance of these coils, or any one of them, therefore, cannot come' in the line between any two subscribers, whether on the same line or on-different lines, when connected for conversation.

I have shown a transmitter at each station in the circuit of a local battery connected in the well-known way through the primary of the induction-coil. The local circuit is shown closed at station B, while the local circuit at 4 station C is shown open.

I claiml. The combination, at the sub-stations of a telephone-line, of switches, bell-magnets, and generators, (one switch, one bell-magnet, and one generator being at each sub-station,) said switches being connected in line' in the telephone-line, so as to be in circuit nearer the central office than any of said bell-magnets or generators. whereby any subscriber, by Inoving the switch of his station, may cut off all generatorsand bell-magnets upon the line,

- substantially as and for the purpose specified.

2. A telephone -line extending from the central office through two, three, or more subscribers stations, and back through signaling apparatus at said stations, in combination with switches placed in line in said telephoneline, one'at each subscribers station, whereby the signaling' apparatus of all subscribers stations on the line may be cut off at any one of said subscribers s tations.-

3; A telephone-line extending through signaling apparatus at each of two or more stations, in combination with telephones, one in the ground-line of each station, and switches, o ne at each station, whereby all the signal-instruments may be cut off from the portion of the line which is being used for conversation.

CHARLES E. SCBIBNER.

Witnesses: l

WILLIAM S. GRANGER, GEORGE I?. BARTON.

IOO 

